section 5.5 solving multi-step equations and inequalities
TRANSCRIPT
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S E C T I O N 5 . 5
SOLVING MULTI-STEP EQUATIONS AND
INEQUALITIES
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OBJECTIVES
• Solve multi-step equations
• Solve multi-step inequalities
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NOTES
• You can solve equations and inequalities with grouping symbols.
• First, use the Distributive Property to remove the grouping symbols.
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EXAMPLES
• 1. 3 = 4(x + 2)
• 2. 4(b - 3) < 72
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EXAMPLES
• 3. Solve 4(x + 5) = 3(2x + 4)
• 4. 12m + 12 = 6(3m + 3)
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WORD PROBLEM
• Mariella’s parents have budgeted $575 for her birthday party. The cost of the party room is $75. How much can the family spend per guest on food if each of the 40 guests receives a $5 favor? Write and solve an equation.
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SOLVE MULTI-STEP INEQUALITIES
• Solve each inequality. Graph the solution on a number line.
• 5. -2(k + 1) > -16+ 5k
• 6. 2p + 5 > 3(p - 6)
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NO SOLUTION OR ALL NUMBERS AS SOLUTIONS
• Some equations have no solution. When this occurs, the solution is the __________________, shown by the symbol 0 or ().
• Other equations may have every number as their solution.
• An equation that is true for every value of the variable is called an __________.
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EXAMPLES
• 1. 3(y - 5) + 25 = 3y + 10
• 2. -5s – 14 = 2(2s + 3) – 9s
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EXAMPLES
• 3. -2(3r + 4) = -5r – 8 – r
• 4. 14 + 8w = 4(8 + 2w)
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H.O.T. PROBLEMS
• 1. Write a multi-step inequality that can be solved by first adding 3 to each side.
• 2. Explain how you can solve45> -6x + 3 without multiplying or dividing by a negative number.